Plough layer is thin with much hindering elements.
耕层浅薄，障碍因素较多。
It increased plough layer soil water and available nutrients content.
大豆覆膜增加了土壤水分与速效养分含量。
The results showed that the grain yield and rice quality decreased under the conditions of thin plough layer.
结果表明，薄耕层使米质变劣，产量锐减。
Soil magnetism of the plough layer is in relatively good correlation with organic carbon and P but shows a rather poor correlation with N and K.
耕作层的土壤磁化率与有机碳、磷含量具有较好的相关性，而与氮、钾含量相关性较差。
Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in plough layer under different planting systems was studied.
研究施钾和秸秆还田对华北地区不同种植制度下作物产量和耕层土壤钾素状况的影响。
The content of available nitrogen in plough layer at the vegetative stage is higher than that at the reproductive stage, but opposite for available phosphorus.
不同处理耕层土壤速效氮含量营养阶段均高于生殖阶段，速效磷含量则相反。
The variation of organic-mineral complex content and the distribution characteristics of organic carbon fractions in black soil plough layer under different tillage periods;
研究了不同耕作方式下黑土有机无机复合体组成及有机碳在各级复合体中的分布特征。
The organic carbon content in each organic-mineral complex of tillage layer is decreasing obviously with tillage period increasing, and that also has a decreasing trend in below plough layer.
黑土耕层各复合体中有机碳含量均明显减少，犁底层亦表现出降低的趋势。
The organic carbon content in each organic-mineral complex of tillage layer is decreasing obviously with tillage period increasing, and that also has a decreasing trend in below plough layer.
黑土耕层各复合体中有机碳含量均明显减少，犁底层亦表现出降低的趋势。
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